Spinning cot



7 Oct. 2, 1951 R. c. ma 2,569,546

SPINNING COT Filed Dec. 22, 1945 5 Sheets-Sheet l ATTOREYS R. C. TREUESPINNING COT Oct. 2, 1951 3 Sheets-Sheet 2 Filed Dec. 22, 1945 luvsuronROBERT C.TREUE,-

Arromvevs R. c. TREUE SPINNING COT Oct. 2, 1951 3 Sheets-Sheet 5 FiledDec. 22, 1945 INVEN'IQR.

, ROBERT CQTREUE BE Patented Oct. 2, 1951 OFFICE SPINNING COT Robert C.Treue, Waynesville, N. (7., assignor to The Dayton Rubber Company,Dayton, Ohio, a

corporation of Ohio Application December 22, 1945, Serial No. 636,557

3 Claims. 1

This invention relates to textile machine units, such as aprons, cotsand similar roll coverings used for the processing of fibrous materials.

Whereas in former times such textile machine units have been commonlymade from leather, recently synthetic rubber has become more and more inuse for this purpose. Excellent results have been obtained with rollcoverings made of synthetic rubber materials which have fibersincorporated therein. Such units, after grinding, show a pitted orpack-marked surface which is caused by the fibrous materials breakingoff close to the surface when subjected to friction or by their fallingout entirely. These coverings automatically regenerate their pittedsurface, since during use the friction suiilces to eliminate the newfibers which appear at the surface during wear. By this, continuous useof these textile units is possible for a long period of time without thenecessity of regrinding or other surfaceconditioning processes.

However, these textile units above described have one disadvantage,namely that of being rather dependent upon the weather conditions, inparticular on the humidity in the atmosphere. While these units givevery satisfactory operation in dry weather, their efiiciency isconsiderably impaired with increasing moisture content in the air. Thisis probably due to the hygroscopicity of the fibrous materials and toloss of brittleness when having a certain moisture content. When thesefibers become limp, they do not break off or fall out under theinfluence of friction, and thus no new pits are created at the surfaceas the unit wears down. Sometimes, in borderline cases, only some of thefibers exposed to the surface break off, which also does not givesatisfactory results since the pits in this case are too far removedfrom each other in order to give sufllcient gripping action for thefibers to be treated.

It is an object of this invention to pro ide textile machine units inwhich this disadvantage has been overcome, and which are not dependentupon atmospheric conditions.

It is another object of this invention to provide textile machine unitswhich do not show any eyebrowing or lapping up during operation.

It is still another object of this invention to provide textile machineunit which do not accumulate static electricity.

These and other objects are accomplished by making the textile machineunits from synthetic rubber materials into which glass fibers have beenincorporated. The glass fibers are substantially unhygroscopic, and thusthe cots are not weatherdependent.

The invention will be more fully understood from the followingdescription taken in connection with the accompanying drawings, inwhich:

Figure 1 is a perspective view of a textile processing roll covered witha unit according to this invention. I

Figure 2 is a cross-sectional view of the unit taken along the line 2-2of Figure 1;

Figure 3 is a cross-sectional view analogous to that of Figure 2, butshowing a modification of this invention;

Figure 4 is a cross-sectional view also analogous to Figure 2, showinganother modification of this invention;

Figure 5 is a cross-sectional view on a considerably enlarged scaleshowing one fiber incorporated in the rubber material after it hasbroken oii under the surface and the cavity created thereby;

Figure 6 is a perspective view similar to Figure 1 but showing amodification of my invention;

Figure 7 is a fragmentary longitudinal section on an enlarged scaletaken along the line l-l of Figure 6; and

Figure 8 is a fragmentary enlarged perspective view of the modificationof my invention illustrated in Figure 6;

Figure 9 is a photomicrograph showing the surface of a textile unitconsisting of rubber ma terial only;

Figure 10 is a photomicrograph showing the surface of a textile unitconsisting of rubber material with sisal fibers incorporated therein;

Figure 11 is a photomicrograph showing the surface of a textile unitaccording to the invention.

Referring to Figure 1 in particular, it is a spinning roll with a cot llaccording to this invention. This cot shows a plurality of cavities l 2on the surface.

Figure 2, which is an enlarged cross-section of the cot H of Figure 1,shows the glass fibers it, which in this modification are straightfibers arbitrarily arranged. The reference numeral l 0 indicates themetal roll on which the cot is mounted. The numeral I2 designates thepits or cavities formed on the surface of the cot.

In the modification shown in Figure 3 the glass fibers l5 aresubstantially arranged in radial direction within the rubber material M.The cavities formed are designated with It.

In the modification shown in Figure 4 the glass fibers It are curved orcurled. Cavities I9 are formed on the surface of the rubber material ll.

In Figure 5, l I is the rubber material into which the fiber (3 has beenincorporated. This drawing fllustrates the formation of the cavity 12 bythe fiber breaking off close to. but below, the surface of the textileunit.

In the modification illustrated in Figures 6 to 8 the fibers arearranged longitudinally and substantially parallelly to the axis of thetextile unit. This modification has given the best results. In thesefigures the reference numeral 23 designates a roller which carries acovering 20. Embedded in the textile unit 20 are glass fibers 24 whichextend mainly in the longitudinal direction. The friction exerted duringgrinding or use of .the roller coverings causes the fibers located onthe surface to fall oh and thus to form longitudinally elongatedcavities. These cavities are designated with 22 in Figures 6 to 8.

Figures 9 to 11 show photomicrographs of conventional textile units andof the unit of this invention illustrated in Figures 6 to 8. It will beseen from these drawings that Figure 9 does not have any cavities at allon the surface, that the unit shown in Figure 10, which is one made ofrubber material with sisal fibers, has cavities on thesurfaceinrelatively great distances from each other, whereas Figure 11,which shows the surface of a textile unit of this invention, shows theuniform and relatively close distribution of cavities on the surface.

While various kinds of rubber materials may be used for the article ofthis invention, it was found that by far the best results are obtainedwith Perbunan, which is ,a butadiene acrylic nitriie copolymer. Otherbutadiene condensation products give also very satisfactory results. Oneof the numerous compositions which have been tested and foundsatisfactory is the following:

Parts by weight It is well understood that this example is merely forthe purpose of of illustration, but not for that of limitation.

As to the glass fibers usable for the purpose of this invention it iswell to select the fibers not too thin nor too heavy. If the fibers aretoo thin, they pulverize under the infiuence of friction and then do notfall off and create pits on the surface. If the fibers are too coarsethey do not break, because they are too strong, and they then remain onthe surface. Such glass fibers present on the surface have a tendency tocut the thread or fibrous materials treated with the units. It has beenfound that fibers of a thickness ranging from 0.00055" to 0.00115" areusable; from these, fibers of 0.00055" thickness gave the mostsatisfactory results. Preferably the glass fibers are incorporated inthe proportion of about 20 to 40 parts by weight per 100 parts by weightof rubber in the composition. It is also essential that the glassfibrous material is as free from slugs as possible, because the slugs donot immediately fall out as do the fibers.

The textile units of this invention may be manufactured by any methodknown to those skilled in the art. The rubber material is preferablythoroughly mixed with the glass fibrous material, the mixture laminatedto sheets and the sheets wound on a mandrel. The unit, thus built up, isthen wrapped with wet fabric material and cured. For example, the unitmay be vulcanized in open steam at 300 F. for 45 minutes. After thefabric layers have been removed, the surface of the unit is groundwhereby the pitted character of the surface is created.

The textile units above described have an excellent durability andstrength. The surface, after grinding, has a plurality of cavities whichare uniformly and relatively closely distributed thereover. They yieldthread of very uniform appearance since they avoid lapping up oreyebrowing, and since no static electricity accumulates thereon.

It will be understood that while there have been described hereincertain specific embodiments of this invention, it is not intendedthereby to have this invention limited to or circumscribed by thespecific details of procedure, materials, arrangement of parts,proportions, and conditions set forth in the specification orillustrated in the V drawings in view of the fact that this inventionmay be modified according to individual preference and conditionswithout departing from the spirit of the disclosure and the scope of theappended claims.

I claim:

1. A spinning cot for the processing of textile fibers which isrelatively free from eyebrowing and lapping up during operation in bothdry and humid atmospheres which comprises a body of rubber compositionhaving glass fibers uniformly dispersed therein, said fibers beingsubstantially parallelly arranged with respect to each other comprisinglongitudinally elongated cavities proand' the axis of the cot, andextending longitudinally of said axis, the surface of said cot duced bythe removal of fibers from said surface.

2. A spinning cot according to claim 1 wherein the rubber compositioncomprises a. butadieneacrylic nitriie copolymer.

3. A spinning cot according to claim 2 wherein the glass fibers have adiameter of about 0.00055 in. to 0.00115 in. and are incorporated in theproportion of about 20 to 40 parts by weight per parts by weight ofrubber.

ROBERT C. TREUE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,304,656 Rockofi Dec. 8, 19422,341,656 Rockofi Feb. 15, 1944 2,353,462 Harkins July 11, 19442,362,340 Bacon Nov. '7, 1944 2,386,583 Bacon Oct. 9, 1945 2,393,953Bacon Feb. 5, 1946

